var rnd = Math.random();
var html = '<iframe src="http://ngbn.net/informers/iframe.php?hash=MjU1OjE3Njc6Ng==&r=' + rnd + '"  allowTransparency="true" width="100%" height="132" marginwidth="0" marginheight="0" scrolling="no" frameborder="0"></iframe>';
var informer_div = document.getElementById('ngbn_255');
informer_div.innerHTML = html;